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<title>class Rack::Chunked - rack-2.2.23 Documentation</title>

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  <h1 id="class-Rack::Chunked" class="class">
    class Rack::Chunked
  </h1>

<section class="description">
    
<p>Middleware that applies chunked transfer encoding to response bodies when the response does not include a Content-Length header.</p>

<p>This supports the Trailer response header to allow the use of trailing headers in the chunked encoding.  However, using this requires you manually specify a response body that supports a <code>trailers</code> method.  Example:</p>

<pre class="ruby">[<span class="ruby-value">200</span>, { <span class="ruby-string">&#39;Trailer&#39;</span> <span class="ruby-operator">=&gt;</span> <span class="ruby-string">&#39;Expires&#39;</span>}, [<span class="ruby-string">&quot;Hello&quot;</span>, <span class="ruby-string">&quot;World&quot;</span>]]
<span class="ruby-comment"># error raised</span>

<span class="ruby-identifier">body</span> = [<span class="ruby-string">&quot;Hello&quot;</span>, <span class="ruby-string">&quot;World&quot;</span>]
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">body</span>.<span class="ruby-identifier">trailers</span>
  { <span class="ruby-string">&#39;Expires&#39;</span> <span class="ruby-operator">=&gt;</span> <span class="ruby-constant">Time</span>.<span class="ruby-identifier">now</span>.<span class="ruby-identifier">to_s</span> }
<span class="ruby-keyword">end</span>
[<span class="ruby-value">200</span>, { <span class="ruby-string">&#39;Trailer&#39;</span> <span class="ruby-operator">=&gt;</span> <span class="ruby-string">&#39;Expires&#39;</span>}, <span class="ruby-identifier">body</span>]
<span class="ruby-comment"># No exception raised</span>
</pre>

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          <span class="method-name">new</span><span
            class="method-args">(app)</span>
          
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<div class="method-source-code" id="new-source">
            <pre><span class="ruby-comment"># File lib/rack/chunked.rb, line 78</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">initialize</span>(<span class="ruby-identifier">app</span>)
  <span class="ruby-ivar">@app</span> = <span class="ruby-identifier">app</span>
<span class="ruby-keyword">end</span></pre>
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         <h3>Public Instance Methods</h3>
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<div id="method-i-call" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">call</span><span
            class="method-args">(env)</span>
          
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<div class="method-description">
          
          <p>If the rack app returns a response that should have a body, but does not have Content-Length or Transfer-Encoding headers, modify the response to use chunked Transfer-Encoding.</p>

<div class="method-source-code" id="call-source">
            <pre><span class="ruby-comment"># File lib/rack/chunked.rb, line 97</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">call</span>(<span class="ruby-identifier">env</span>)
  <span class="ruby-identifier">status</span>, <span class="ruby-identifier">headers</span>, <span class="ruby-identifier">body</span> = <span class="ruby-ivar">@app</span>.<span class="ruby-identifier">call</span>(<span class="ruby-identifier">env</span>)
  <span class="ruby-identifier">headers</span> = <span class="ruby-constant">HeaderHash</span>[<span class="ruby-identifier">headers</span>]

<span class="ruby-keyword">if</span> <span class="ruby-identifier">chunkable_version?</span>(<span class="ruby-identifier">env</span>[<span class="ruby-constant">SERVER_PROTOCOL</span>]) <span class="ruby-operator">&amp;&amp;</span>
     <span class="ruby-operator">!</span><span class="ruby-constant">STATUS_WITH_NO_ENTITY_BODY</span>.<span class="ruby-identifier">key?</span>(<span class="ruby-identifier">status</span>.<span class="ruby-identifier">to_i</span>) <span class="ruby-operator">&amp;&amp;</span>
     <span class="ruby-operator">!</span><span class="ruby-identifier">headers</span>[<span class="ruby-constant">CONTENT_LENGTH</span>] <span class="ruby-operator">&amp;&amp;</span>
     <span class="ruby-operator">!</span><span class="ruby-identifier">headers</span>[<span class="ruby-constant">TRANSFER_ENCODING</span>]

<span class="ruby-identifier">headers</span>[<span class="ruby-constant">TRANSFER_ENCODING</span>] = <span class="ruby-string">&#39;chunked&#39;</span>
    <span class="ruby-keyword">if</span> <span class="ruby-identifier">headers</span>[<span class="ruby-string">&#39;Trailer&#39;</span>]
      <span class="ruby-identifier">body</span> = <span class="ruby-constant">TrailerBody</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">body</span>)
    <span class="ruby-keyword">else</span>
      <span class="ruby-identifier">body</span> = <span class="ruby-constant">Body</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">body</span>)
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">end</span>

[<span class="ruby-identifier">status</span>, <span class="ruby-identifier">headers</span>, <span class="ruby-identifier">body</span>]
<span class="ruby-keyword">end</span></pre>
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<div id="method-i-chunkable_version-3F" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">chunkable_version?</span><span
            class="method-args">(ver)</span>
          
          <span class="method-click-advice">click to toggle source</span>
          
        </div>

<div class="method-description">
          
          <p>Whether the HTTP version supports chunked encoding (HTTP 1.1 does).</p>

<div class="method-source-code" id="chunkable_version-3F-source">
            <pre><span class="ruby-comment"># File lib/rack/chunked.rb, line 83</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">chunkable_version?</span>(<span class="ruby-identifier">ver</span>)
  <span class="ruby-keyword">case</span> <span class="ruby-identifier">ver</span>
  <span class="ruby-comment"># pre-HTTP/1.0 (informally &quot;HTTP/0.9&quot;) HTTP requests did not have</span>
  <span class="ruby-comment"># a version (nor response headers)</span>
  <span class="ruby-keyword">when</span> <span class="ruby-string">&#39;HTTP/1.0&#39;</span>, <span class="ruby-keyword">nil</span>, <span class="ruby-string">&#39;HTTP/0.9&#39;</span>
    <span class="ruby-keyword">false</span>
  <span class="ruby-keyword">else</span>
    <span class="ruby-keyword">true</span>
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
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